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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam-antenati.cultura.gov.it/antenati/containers/LooNa67/manifest",
    "isFetching": false
  },
  "viewer": null,
  "window": {
    "canvasId": "https://antenati.cultura.gov.it/ark:/12657/an_ua15313774/03o1jbW",
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-c30fbec9-c158-416b-88b1-5af3a8ccfc5b",
      "cw-9f6f5e9c-ee00-4630-97da-2b55ea168ad2"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-8d1273a9-56ac-416d-a3b4-fc43a0d569e9",
    "manifestId": "https://dam-antenati.cultura.gov.it/antenati/containers/LooNa67/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-9f6f5e9c-ee00-4630-97da-2b55ea168ad2",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "visibleCanvases": []
  }
}